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Topics - Thermionic

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General Radio Discussion / Loran A
« on: July 10, 2020, 0033 UTC »
Does anyone have any WAV or MP3 audio files of Loran A as heard on top Band between  1,750 and 1,950 kc/s..

Utility / Trenton Volmet
« on: April 26, 2020, 0021 UTC »

Utility / Bankok Volmet
« on: April 26, 2020, 0015 UTC »
6670 USB via http://websdr.ewi.utwente.nl:8901

On air 10 and 40 mins

SDR - Software Defined Radio / Kiwi SDRs
« on: March 12, 2020, 2207 UTC »
Why is it these SDRs have time limits. Some cease to be active after so long.

Sorry, this KiwiSDR has an inactivity timeout after 30 minutes.
Reload the page to continue.

While there are others who cut out altogether and then this comes on the screen.

Sorry, this KiwiSDR can only be used for 30 minutes every 24 hours by each IP address.
Please check kiwisdr.com/public for more KiwiSDR receivers available world-wide.

If you have an exemption password from the KiwiSDR owner/admin
please enter it here:

I was listening to Shanwick radio on the emeraldSDR QRG 5598, On the waterfall I also saw Shanwick wkg flights on 5649. I duplicated the tab on browser, so I would be able to listen to 5598 and 5649 simultaneously.  When I clicked on the tab I saw this.

Multiple connections from the same ip address not allowed.
Client ip =

At least you don't get that sort of thing on the likes of Twente,  NA5B and K3FEF et al.


SDR - Software Defined Radio / New To SDR
« on: March 11, 2020, 1535 UTC »
I only discovered WebSDR a couple of days before last Christmas. What brought it to my attention was when I was looking for the sounds and interval signals I used to hear when I was much more active in SWL than I have been lately. I clicked on a link, which turned out to be the Twente WebSDR. I thought what the hell is all this, it didn't take me long to find out what I was looking at.

I've been on the Internet since 2004. I see the Twente SDR came on line in 2008 and was reactivated in July 2012 after an interruption of more than 1.5 years. I can't believe it's taken me until now to discover not only Twente, but other SDRs.

What I first noticed about shortwave radio is how much it has changed since I last listened to it nearly 30 years ago. In my days of SWL there were was no such thing as STANAG, now it's all over the place.  Then there's the waterfall, this was something new to me. I must tell you when I went to bed on the night when I found Twente, all I ever dreamed about was that waterfall.

The second SDR I found was NA5B, which as most of you know is in Washington DC. Back in the days when I used to listen I had a brief flirtation with medium wave DXing and found the odd America and Canadian station on that band. Thanks to NA5B I now have the ability to listen to American AM stations on Medium Wave.   

As there are no broadcasting stations on the long wave band in the North American countries, being a resident of the UK I've often wondered what it sounds like from across the Atlantic. The only station I've heard is Radio Algeria on 252kHz. It's weak, but you can detect audio from it. Moving to 198kHZ which is used by BBC Radio 4, there is a line on the waterfall and a very, very weak carrier wave. One night I could just detect some barely perceptible audio.

It was through the Twente SDR that I found this forum through a link someone had posted in the chatbox.

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